Surveys will be performed in the third trimester and after delivery. During the ultrasound examinations standardized, moving sequences of the heart will be saved. Analyses will be performed off-line and analysed by vector velocity imaging software. With this technique, the investigator can quantify the chamber wall and myocardial movements. Speed (velocity), movement (displacement) and thickening/deformation (strain and strain rate) will be recorded in a structured and standardized manner.